Set up environment for CI

phpcs-errors:0 phpunit-status:successful

tests/config.xml

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+<phpunit
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/|version|/phpunit.xsd"
+        backupGlobals="true"
+        backupStaticAttributes="false"
+        cacheResult="true"
+        cacheTokens="true"
+        colors="false"
+        convertErrorsToExceptions="false"
+        convertNoticesToExceptions="false"
+        convertWarningsToExceptions="false"
+        forceCoversAnnotation="false"
+        printerClass="PHPUnit\TextUI\ResultPrinter"
+        processIsolation="true"
+        stopOnError="true"
+        stopOnFailure="true"
+        stopOnIncomplete="true"
+        stopOnSkipped="true"
+        stopOnRisky="true"
+        testSuiteLoaderClass="PHPUnit\Runner\StandardTestSuiteLoader"
+        timeoutForSmallTests="1"
+        timeoutForMediumTests="10"
+        timeoutForLargeTests="60"
+        verbose="false">
+	<filter>
+		<whitelist processUncoveredFilesFromWhitelist="true">
+			<directory suffix=".php">../home/</directory>
+			<directory suffix=".php">../inc/</directory>
+			<!-- <file>/path/to/file</file>
+			<exclude>
+				<directory suffix=".php">/path/to/files</directory>
+				<file>/path/to/file</file>
+			</exclude>-->
+		</whitelist>
+	</filter>
+</phpunit>
+

tests/startPageTest.php

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+<?PHP
+/**
+ * This script contains tests for the home page.
+ *
+ * @author Joshua Ramon Enslin <joshua@jrenslin.de>
+ */
+declare(strict_types=1);
+
+// phpcs:disable
+
+use PHPUnit\Framework\TestCase;
+
+final class StartPageTest extends TestCase {
+
+    public function testHTMLOutput():void {
+
+        include __DIR__ . "/../index.php";
+        $output = $this->getActualOutput();
+
+        $this->assertEquals(
+            true,
+            is_string($output)
+        );
+
+        ob_clean();
+
+    }
+
+}